diff --git a/Tests/test_file_ppm.py b/Tests/test_file_ppm.py
index 1832e3e46..ddeded6fb 100644
--- a/Tests/test_file_ppm.py
+++ b/Tests/test_file_ppm.py
@@ -86,7 +86,7 @@ def test_32bit_plain_pgm(tmp_path):
 def test_plain_pbm_data_with_comments(tmp_path):
     path1 = str(tmp_path / "temp1.ppm")
     path2 = str(tmp_path / "temp2.ppm")
-    comment = b"# veeery long comment" * 10 ** 6
+    comment = b"# veeery long comment" * 10**6
     with open(path1, "wb") as f1, open(path2, "wb") as f2:
         f1.write(b"P1\n2 2\n\n1010")
         f2.write(b"P1\n2 2\n" + comment + b"\n1010" + comment)
@@ -118,7 +118,7 @@ def test_plain_pbm_invalid_data(tmp_path):
 def test_plain_ppm_data_with_comments(tmp_path):
     path1 = str(tmp_path / "temp1.ppm")
     path2 = str(tmp_path / "temp2.ppm")
-    comment = b"# veeery long comment" * 10 ** 6
+    comment = b"# veeery long comment" * 10**6
     with open(path1, "wb") as f1, open(path2, "wb") as f2:
         f1.write(b"P3\n2 2\n255\n0 0 0 001 1 1 2 2 2 255 255 255")
         f2.write(
diff --git a/src/PIL/PpmImagePlugin.py b/src/PIL/PpmImagePlugin.py
index 9a5cac7d0..cae078d02 100644
--- a/src/PIL/PpmImagePlugin.py
+++ b/src/PIL/PpmImagePlugin.py
@@ -145,7 +145,7 @@ class PpmImageFile(ImageFile.ImageFile):
 class PpmPlainDecoder(ImageFile.PyDecoder):
     _pulls_fd = True
 
-    def _read_block(self, block_size=10 ** 6):
+    def _read_block(self, block_size=10**6):
         return bytearray(self.fd.read(block_size))
 
     def _find_comment_end(self, block, start=0):
@@ -218,9 +218,9 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
     def _decode_blocks(self, channels=1, depth=8):
         decoded_data = bytearray()
         if depth == 32:
-            maxval = 2 ** 31 - 1  # HACK: 32-bit grayscale uses signed int
+            maxval = 2**31 - 1  # HACK: 32-bit grayscale uses signed int
         else:
-            maxval = 2 ** depth - 1  # FIXME: should be passed by _open
+            maxval = 2**depth - 1  # FIXME: should be passed by _open
         max_len = 10
         bytes_per_sample = depth // 8
         total_tokens = self.size * channels